A) zero
B) 0.5
C) 1.0
D) depends on values of L, C and R
Correct Answer: C
Solution :
Average power of circuit is given by \[P={{E}_{rms}}\times {{i}_{rms}}\times \cos \phi \] In a series LCR circuit at resonance voltage and current being in same phase, therefore\[\phi =0\]. Hence, power factor\[=\cos \phi =cos{{0}^{o}}=1\]
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